Abstract
In order to determine the capacity of the cold neutron source refrigerator of HANARO, the nuclear heating rate at CN vertical hole is measured by using the heat-flow calorimetric method and confirmed by the calculation. The heating rate measurement device of HANARO was composed of a calorimeter sensor, an air containing aluminum sleeve for fitting the sensor to the CN hole, aluminum weight and a lead wire assembly. The calorimeter sensor consists of a cylindrical Al sample and container, two thermocouples and the electric heater for the calibration of the calorimeter. The sample is separated by an air gap from the Al container surrounded by an air containing Al sleeve. After installation of the calorimeter at a measurement position of HANARO, the heat transfer inside the calorimeter was simulated by the electric heating for the sample. The nuclear heating rates at the CN hole were determined at three reactor powers of 1, 4 and 8 MW by using the calibration curve and the temperature measurements at each reactor power. The measured nuclear heating rate per unit mass of Al sample at 8 MW reactor power is 0.143 W/g and it is equivalent to the 0.494 W/g at 30 MW. The nuclear heating rate was calculated by using the MCNP code. The calculation model for the whole facility including the reactor core and the reflector tank were established. In the calculation procedure, the heat generations by various radiations were evaluated with considering the prompt, delayed and activation effects. The measured heating rate was reasonably well supported by the calculation using the cold neutron facility design code. It will be very useful for the moderator cell of cold neutron source of HANARO.
Highlights
T HE heat removal capacity of the moderator cell is essential information for a cold neutron source (CNS) design in a research reactor
The nuclear heating rates at the CN hole were determined at three reactor powers of 1, 4 and 8 MW by using the calibration curve and the temperature measurements at each reactor power
The nuclear heating rate at CN vertical hole of HANARO was confirmed by measurement and calculation
Summary
T HE heat removal capacity of the moderator cell is essential information for a cold neutron source (CNS) design in a research reactor. In order to determine the capacity of the refrigerator, the nuclear heating rate at the CNS position should be confirmed. The nuclear heating in a research reactor arises from the nuclear fissions and the interactions with gamma-rays, fast and thermal neutrons. The heating rate can be determined by several methods such as the calorimetry, the ionization chambers and the chemical dosimeters [1]. The operation of the calorimeter is possible by measuring the total amount of energy that is deposited as heat in an isolated mass. The measurement of the temperature rise in a calorimetric dosimeter provides a direct measurement of the full energy imparted to matter by radiation. The thermocouples and the thermistors are sufficiently sensitive and small enough to measure the temperature change with sufficient accuracy and precision [2]
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